// :mode=c++:
/*
decode.h - c++ wrapper for a base64 decoding algorithm

This is part of the libb64 project, and has been placed in the public domain.
For details, see http://sourceforge.net/projects/libb64
*/
#ifndef BASE64_DECODE_H
#define BASE64_DECODE_H

#include <iostream>

namespace base64 {
extern "C" {
#include "cdecode.h"
}

struct decoder {
	base64_decodestate _state;
	int _buffersize;

	decoder(int buffersize_in = BUFFERSIZE) : _buffersize(buffersize_in) {}

	int decode(char value_in) { return base64_decode_value(value_in); }

	int decode(const char* code_in, const int length_in, char* plaintext_out) {
		return base64_decode_block(code_in, length_in, plaintext_out, &_state);
	}

	void decode(std::istream& istream_in, std::ostream& ostream_in) {
		base64_init_decodestate(&_state);
		//
		const int N = _buffersize;
		char* code = new char[N];
		char* plaintext = new char[N];
		int codelength;
		int plainlength;

		do {
			istream_in.read((char*)code, N);
			codelength = istream_in.gcount();
			plainlength = decode(code, codelength, plaintext);
			ostream_in.write((const char*)plaintext, plainlength);
		} while (istream_in.good() && codelength > 0);
		//
		base64_init_decodestate(&_state);

		delete[] code;
		delete[] plaintext;
	}
};

} // namespace base64

#endif // BASE64_DECODE_H
